Retractable tether



FIG. 1 is a top, front and right side perspective view of the retractable tether showing our new design;

FIG. 2 is a front elevational view of the design;

FIG. 3 is a top plan view of the design;

FIG. 4 is a right side elevational view of the design;

FIG. 5 is a left side elevational view of the design;

FIG. 6 is a rear elevational view of the design; and,

FIG. 7 is a bottom plan view of the design.

The portions shown in broken line are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a retractable tether, as shown and described. 